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EPA 540/A5-90/008
In Situ Steam/Hot-Air Stripping Technology
Novaterra, Inc.
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In Situ Steam/Hot-Air Stripping Technology
Novaterra, Inc. (181K)
ABSTRACT
In Situ Steam/Hot-Air Stripping Technology
Novaterra, Inc.
Applications Analysis Report
EPA 540/A5-90/008
March 1991
This technology uses a transportable treatment unit called the Detoxifier for
in situ steam and air stripping of volatile (VOC) and semivolatile organic compounds
(SVOC) from soil. The unit has two counter-rotating hollow-stem drills fitted
with modified cutting bits, 5-feet in diameter; they can operate to a depth
of 33 feet. Concentric pipes convey air (300 oF and 250 psig) and steam (450
oF and 450 psig) in the inner pipes and outer pipes, respectively. The gases
are injected into the soil through the blades. Steam heats the soil and forms
low boiling point azeotropes with contaminants, significantly increasing their
removal efficiency. Air and steam convey these contaminants to a metal shroud
that encloses the process at the surface. The shroud is evacuated by a blower.
The water is separated (condensation), purified (carbon filters), and recycled
into the cooling tower; recovered VOCs are used as incinerator fuel, or recycled.
The demonstration was performed in September 1989, at the Annex Terminal, San
Pedro, California. Removal efficiencies for VOCs and SVOCs were greater than
85% and 55%, respectively; fugitive emissions were low.
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Posted February 26, 1999
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